A Cluster Merger and the Origin of the Extended Radio Emission in Abell 3667

Details A Cluster Merger and the Origin of the Extended Radio Emission in Abell 3667 A Cluster Merger and the Origin of the Extended Radio Emission in Abell 3667

1999-02-08

arxiv.org/abs/astro-ph/9902115v1

Astronomy and Astrophysics

Astrophysics

21 pages, 5 figures, fig1a.ps is a higher resolution version of fig1.ps. It has produced errors when incorporated into Latex,

Scientific paper

10.1086/307327

We present a numerical model for the extended steep-spectrum radio sources and the elongated X-ray structure in A3667 based on new 3-dimensional MHD/N-body simulations. The X-ray and optical analyses of A3667 indicate that it has undergone a recent subcluster merger event. We believe that the Mpc-scale radio sources identified in A3667 are also a consequence of the merger. Our previous numerical simulations show that mergers often produce large-scale shocks and turbulence capable of both magnetic field amplification and in-situ reacceleration of relativistic particles. Our model suggests that these radio structures, separated by ~2.6 h^{-1}_100 Mpc, are in fact causally linked via a slightly off-axis merger that occurred nearly in the plane of the sky approximately 1 Gyr ago with a subcluster having a total mass equal to ~20% of the primary cluster.

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